Originally posted by: Stealthslide The good news is that there is a knowledge base on this topic. The bad news is there is no practical fix.
Basically the displayport can't be synchronised with the DVI port and this causes the horizontal refresh tear.
The solution: run all displayport. If you use DVI you have to put up with it.
This is why I will buy Nvidia unless there is a Radeon 8X video card with 3 or more displayports other wise you are doomed to suffer the tear.
This is Eyefinitys great secret shame. It seriously mars an otherwise awesome feature but there is hardly anything about it on the web.
The reason why it is secret is because if people who bought AMD for Eyefinity found out you need a rare Eyefinity edition or 4 display port video card and all display port monitors (very much in the minority). They would just take the easy solution and buy Nvidia.
It wouldn't be so bad if it wasn't AMD's fault but why on earth would they have people sell video cards with only 2 displayports. It means they are just ignoring the design fault and have no respect for people who wish to use the Eyefinity feature.
Cards with less than 3 displayports should not be labeled as Eyefinity.
The displayport CAN be synchronized with the DVI port. I recently upgraded from a 5870 with no tearing to a 7970 with tearing.
Windows 7 Pro 64: (DVI)(DVI)(DP->DVI) Currently on CCC 13.9 with 3 identical ASUS monitors.
This issue is widespread and not well known until you own the card. I checked reviews before this purchase from many sites and I did not see this issue anywhere. I chose the 7970 because I had no problems with the 5870 and I wouldn't require any new connections.
I have tried disabling the HDMI audio, but that didn't work. I have tried the use centered timings with no luck. I can choose a basic theme under personalization and that will stop the tearing, but movements become very rough (jagged window borders when dragging). Some people claim it goes away and comes back but I think for some of them, they just don't realize that the tear is slowly moving down the screen and when at the extreme top or bottom, it is harder to see. If DP is set as preferred display, then the 2 DVI screens have the tear. If DVI is set as preferred, the DP has the tear.
1) Because the tear will vanish with a different profile (basic) and 2) the tear did not exist with my 5870 with the same cable connection, this leads me to believe it can be fixed.
Is there any new information on a fix for this?